Each issuer which has filed a registration statement containing an undertaking which is or becomes operative under this subsection as in effect prior to August 20, 1964, and each issuer which shall after such date file a registration statement which has become effective pursuant to the Securities Act of 1933, as amended [
15 U.S.C.
77a et seq.], shall file with the Commission, in accordance with such rules and regulations as the Commission may prescribe as necessary or appropriate in the public interest or for the protection of investors, such supplementary and periodic information, documents, and reports as may be required pursuant to section
78m of this title in respect of a security registered pursuant to section
78l of this title. The duty to file under this subsection shall be automatically suspended if and so long as any issue of securities of such issuer is registered pursuant to section
78l of this title. The duty to file under this subsection shall also be automatically suspended as to any fiscal year, other than the fiscal year within which such registration statement became effective, if, at the beginning of such fiscal year, the securities of each class to which the registration statement relates are held of record by less than three hundred persons. For the purposes of this subsection, the term “class” shall be construed to include all securities of an issuer which are of substantially similar character and the holders of which enjoy substantially similar rights and privileges. The Commission may, for the purpose of this subsection, define by rules and regulations the term “held of record” as it deems necessary or appropriate in the public interest or for the protection of investors in order to prevent circumvention of the provisions of this subsection. Nothing in this subsection shall apply to securities issued by a foreign government or political subdivision thereof.